Geography, 04.02.2020 10:58 cxttiemsp021

Which of the following happens when a low-mass star runs out of fuel? choose all that apply.
a. its outer layers expand, and the star becomes a red giant.
b. its outer layers form a nebula, or a vast cloud of gas and dust.
c. its core becomes a white dwarf.
d. gas and dust in a nebula contract to form a protostar.

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Which of the following happens when a low-mass star runs out of fuel? choose all that apply.
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